package com.csw.shuanfa.SuanFa;

import java.util.HashSet;
import java.util.Set;

public class AZ {
    public static void main(String[] args) {
        int i = 1;
        Set set = new HashSet();
        while (i <= Math.pow(10, 6)) {
            char c = (char) ('A' + Math.random() * ('Z' - 'A' + 1));
            ////c);
            set.add(c);
            i++;
        }
        //set.toString());

    }
}
